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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9504) MetricsDynamicMBeanBase has concurrency issues in createMBeanInfo
Date Sat, 27 Apr 2013 02:12:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13643464#comment-13643464
] 

Liang Xie commented on HADOOP-9504:
-----------------------------------

bq. the racing threads in createMBeanInfo are trying to publish the same values to the map

yeh, you got it:)
                
> MetricsDynamicMBeanBase has concurrency issues in createMBeanInfo
> -----------------------------------------------------------------
>
>                 Key: HADOOP-9504
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9504
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 3.0.0, 2.0.3-alpha
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>            Priority: Critical
>         Attachments: HADOOP-9504.txt, HADOOP-9504-v2.txt
>
>
> Please see HBASE-8416 for detail information.
> we need to take care of the synchronization for HashMap put(), otherwise it may lead
to spin loop.

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